Communication detecting method and system for electric current loop communication circuit

Abstract

The invention is applied to the field of communication detection of an air-conditioning system and provides a communication detecting method and system for a current loop communication circuit. It is judged whether the receiving end, on the indoor side or outdoor side, of the circuit loop communication circuit receives air-conditioner regular communication data when a sending end photocoupler on the indoor side or the outdoor side of the current loop communication circuit is controlled to be powered on, if the air-conditioning regular communication data are not received, the sending end photorcoupler on the indoor side or outdoor side of the current loop communication circuit is controlled to be powered off after delay, detecting frequency data preset in storage space are updated, if the detecting frequency data equals a preset frequency threshold value, it is indicated that the wiring mode of the current loop communication circuit is false, and an air conditioner can send out fault prompt and end communication progress between the indoor side and the outdoor side of the air conditioner, so that the current loop communication circuit stops working, and the aim of protecting control panels of an indoor unit and an outdoor unit of the air conditioner against damage is achieved.

Description

technical field [0001] The invention belongs to the field of communication detection of an air-conditioning system, and in particular relates to a communication detection method and system of a current loop communication circuit. Background technique [0002] Current loop communication is a method to achieve communication by detecting the magnitude of the current in the current loop or whether there is a conduction current. The current loop communication circuit has strong anti-interference ability and less communication connection lines, so it is widely used in industrial Control and home appliance control fields, and the current household air conditioners generally use the above-mentioned current loop communication circuit (such as figure 1 The current loop communication circuit of the single-phase power supply shown) performs communication control on the indoor unit and the outdoor unit. The AC power is half-wave rectified by the diode D3 on the indoor communication circ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a communication detection method for a current loop communication circuit, which aims to solve the problem that the control boards on both sides of the indoor and outdoor will be damaged when the existing current loop communication circuit is connected incorrectly on both sides of the indoor and outdoor

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